Asked whether Mr. Medvedev would meet with Google Chief Executive Eric Schmidt or Mr. Brin after arriving in San Francisco Tuesday, top presidential aide Arkady Dvorkovich said only that the president would be meeting with Mr. Schmidt. Google Russia said it was unclear why a meeting with Mr. Brin would not take place but noted that Mr. Schmidt is on the board of directors at Skolkovo, a planned innovation center outside Moscow.

Mr. Brin, who was born in Moscow and emigrated from the Soviet Union in 1979 at the age of six, has been critical of Russia in the past. In a 2002 interview with California-based Red Herring, he dubbed the corruption-plagued country “Nigeria with snow” and asked why a “bunch of criminal cowboys” should control the world’s energy supply.

The company he founded also ran foul of Russia’s anti-monopoly service when it tried to buy advertising company Begun for $140 million in 2008, an acquisition which would have boosted Google’s share of Internet advertising in Russia. Analysts said at the time that the deal was quashed to keep strategic assets, including the Internet, in Russian hands.

Executives from Google’s main rival in Russia, Yandex, are accompanying the Russian delegation to Silicon Valley.

Google has been known for bristling when governments take too heavy a hand. The company stopped censoring search results in China earlier this year and threatened to leave the market completely when it accused Beijing of orchestrating a cyber-attack against it.